PMK/HBH senior Joy Fehily is leaving the celeb praisery after 13 years to start her own agency.

Over the years, Fehily has built up a power list, representing such clients as Graham King, Joel Silver, McG, Gerard Butler, Seth MacFarlane, Aaron Sorkin, Peter Morgan, Anthony Zuiker and Eric McCormack. She is expected to take most of her clients with her, having brought everyone but Sorkin into the agency.

Fehily, who also worked at Castle Rock Entertainment as a publicist for two years, hasn't yet named her new venture.

The 13-year veteran, who held the title of senior vp, has clients including Graham King, Peter Morgan, McG, Gerard Butler, Seth MacFarlane, Aaron Sorkin, Joel Silver, Anthony Zuiker and Eric McCormack. Most if not all are expected to travel with her.

"It's definitely bittersweet," PMK's Simon Halls said. "But on the flip side, I did the same thing, starting my own company with partners. So I understand her wanting to try this new adventure. We are extremely grateful for everything she has done for this company."